Sawing implement



Dec. 29, 1931. w. WIRTZ SAWING IMPLEMENT Filed Aug. 20, 1931 .QQQQQQO 90 0 0 0 0 0 INVENTOR) Willant fifiz,

y Ms ATTORNEY Patented Dec. 29, 1931 5 1 ETE STATES PATENT GFFEEEWILLIAM WIRTZ, F CRISTOBAL, PANAMA CANAL ZONE SAWIN'G IMPLEMENTApplication filed August 20, 1931. Serial No. 558,294.

This invention relates to sawing implebetween the sliding member and itsdriving ments and it consists in certain improvemeans. 7 ments inimplements of this class which have 1 designates the frame, whichincludes a heretofore been proposed, to wit, comprising, suitable grip 2and a casing 3. This may be,

v with a fixed hand-gripped structure, a toothformed as an integralstructure, as shown,

ed or cutting sliding member to reciprocate and the grip and casing arepreferably on said structure and driving means for the formed withdownward extensions 2a and 3a sliding member arranged in the fixedstrucwhich serve as guides, as will appear.

ture. Heretofore no implement of this type The casing contains a motor4, here an m has been devised, so far as I am aware, which electricmotor, whose rotary driving member could pass clear through the materialbeing 5 has its axis of rotation here so arranged sawed without havingthe sliding member that the wheel or face-plate 6 thereof lies inunbacked or unsupported for substantially a plane perpendicular to thatof the saw its full length by the fixed structure (see blade, said wheelbeing below the casing 3.

5 U. S. Patent No. 1,592,999) or except where l he wheel has a wrist-pin7 to which is pivthe sliding cutting memberwas duplicated,the oted alink 8 in turn pivoted to the reciprocattwo such sliding cutting membersbeing aring bar 9 which is confined in and by the ranged side by sideand in a groove in the guides 2a and 3a in a path extending lengthfixedstructure provided for keeping them wise of the saw and perpendicularlyto the 0 in this relation (see U. S. Patent No. 139,426). axis of thedriving member 5. The motor,

vAccording to invention the fixed handits driving member, the link andbar are gripped structure has a fixed blade member herein taken as thedriving means. 1a is a and the sliding cutting member is arranged coverprovided for housing these parts. and maintained in the same plane asand in The casing also contains means for startlapped l ti t th fixed mb r and ing and stopping the motor. The motor besaid members togetherform the blade of the -Q rically driven in the present instance, i l t ad h v their surfaces at each 10 is a cable extending from the frame 1and side of such blade substantiallv flush with comprising twoconductors 11 and 12 coneach other, or at least the sliding membernected to the respective terminals of the Inopresents the maximumthickness of the blade. tor field and the latter of them including aThereby I provide a sawing implement that pivoted trigger or switch 13in permanent can pass clear through the material being connection withone terminal at a break 12a sawed and in the nqe nber may in COIldllCtOll2 and fldtlptd t0 be I11OV8Cl llltO be backed by the first member forsubstantialcontact With the other terminal at said break 7 lv its entirelength and considerable simby the operators forefinger to close the cir-35 rilification of structure results and certain cuit and thereby drivethe motor, 1 being a other advantages obvious to those skilled in springnormally holding the switch out of the art follow. Other novel andadvancontact with the latter terminal. The cable 40 tageous features ofmy invention will appear its free end is of course to have itsconhereinafter. ductors connected to the terminals of a suit- In'thedrawings. able source of electrical energy, as by plug- Fig. 1 is a sideelevation of the improved ging a suitable fitting on the cable into aconimplement; venient socket. The motor is started or stop- Fig. 2 is aside elevation on a larger scale ped by application or release ofpressure on of the handle end of the implement and showthe switch. r inga certain cover 1a removed; The blade as a whole has uniform thick- Fig.3 is a section on line 33, Fig. 2; ness like the blade of an ordinarysaw, this of Fig. is an underneath plan of what is course applying tothe construction shown 50 shown in Fig. 2; and by way of example and aswill appear. It Fig. 5 illustrates the parts of the coupling comprisestwo blade members lying in the same plane. Member 16 is the fixed oneand may be secured to the frame by rivets 17 or the like and it formswith said frame the fixed hand-gripped structure. The other member 18 isreciprocatory lengthwise of the saw and is a strip having its lower edgeserrated, at 19, to form the saw teeth. At its lower edge on one sidemember 16 has a longitudinal rabbet 16a and at its upper edge on therelatively opposite side member 18 has a conforming rabbet 18a, the twothus-rabbeted edges being formed to fit each other and being each ofsuch depth (here about half the thickness of the blade) that when theyare assembled to form the blade their surfaces at each side of .theblade are substantially flush with each other, or at least the slidingmember presents the maximum thickness of the blade. The member 18 hassliding contact with the member 16 at the surfaces to which thelead-lines for the hereinafter mentioned reference characters 16?) and18?) are applied, so that it is supported directly by member 16, thusavoiding wear on the means for maintaining them in the lapped relationwhich consists of headed studs 20 on member 16 received by longitudinalslots 21 0f member 18 too narrow to permit the heads of the studs topass therethrough, except as will be indicated; and 1 preferably alsoundercut each rabbet to form a groove 16b, 18b in which takes theadjoining edge of the opposite member, which is shaped to conform withand snugly fit the groove. The heads of the studs may be countersunk, asby bevelling thesa-me and the sides of the slots, as shown in Fig. 2, sothat said heads will not project to interfere with the passage of theblade through the material being sawed.

The member 18 is reciprocated by being connected to the bar 9 of thedriving means. This connection is here such that the member 18 may bedetached from the bar. The end of the bar is rabbeted, as at 9a, toreceive the adjoining end of member 18 and through them is passed aheaded stud 22 which has a circumferential groove 2264 at its free endadapted to receive a spring clip 23; when this clip is detached from thestud the latter can be withdrawn to uncouple member 18 from I the bar.

In order to render member 18 separable from member 16 each slot 21 hasan enlarged extension 21a wide enough to permit the corresponding studhead to pass therethrough. The throw of the member 18 is preferably lessthan the over-all length of the slots so that when the member 18 isbeing driven the studs cannot engage in the slot-extensions, al thoughupon uncoupling said member from bar 9 said member may be moved to theposition where thestuds will register with the extensions so as todetach said member.

My invention results in a sawing implement of the class indicated whichwill pass clear through the material and yet involves completesimplicity and is exceedingly strong and proof against undue wear. Inpractice I have found that the implement operates to better advantagewhen the sliding member is rapidly driven, as by omitting anygearingdown from the driver 5 to the bar 9.

A further novel feature of my invention is that each side of the slidingmember forms with the corresponding side of the fixed memher a side ofthe blade of the implement.

Having thus fully described my invention, I claim:

1. A sawing implement comprising a fixed hand-gripped structure having afixed blade member, a sliding blade member arranged in the same plane asand lapping the fixed member and having its edgeremote from the lattersaw-toothed, means to maintain said members in lapped relation to eachother, said members together forming a blade and the sliding memberpresenting the maximum thickness of the blade, and driving means for thesliding member arranged in the fixed member.

2. A sawing implement comprising a fixed hand-gripped structure having afixed blade member, a sliding blade member arranged in the same plane asthe fixed member and having its edge remote from the latter sawetoothed,the adjoining edge portions of said members being rabbeted and each suchrabbet of one member receiving the rabbeted edge portion of the other,means to maintain said members in lapped relation to eachother, saidmembers together forming a blade and the sliding member presenting themaximum thickness of the blade, and driving means for the sliding memberarranged in the fixed member.

3. A sawing implement comprising a fixed hand-gripped structure having afixed blade member, a slidingblade member arranged in the same plane asthe fixed member and having its edge remote from the latter saw-toothed,the adjoining edge ortions of said members being undercut-ra beted andeach such rabbetof one member receiving in its undercut the rabbetededgeportion of the other, means to maintain said members in lappedrelation to each other, said members together forming ablade and thesliding member presenting the maximum thickness of the blade, anddriving means for the sliding member arranged in the fixed member.

4. A sawing implement comprising a fixed hand-gripped structure havingafixed blade member, a sliding blade member arranged in the same planeas and lapping the fixed member and having its edge remote fromthelatter saw-toothed, one member having a slot extending lengthwise ofthe sliding motion .of the sliding member and the other memlappedrelation to each other, and driving means, disconnectively connected tothe sliding member, for driving the latter and arranged in the fixedmember, said slot having an enlargement permitting passage of the studhead therethrough to detach the sliding member from the fixed member.

In testimony whereof I aflix my signature.

WILLIAM WIRTZ.

